From the physics perspective, the holes won't effect structural integrity significantly as their surface area is minimal vs total area and structural engineering cals are generally done with at least 200% reliability factor, so I would say it was rather a certifier personal problem that he was not okay with that.

But from pure aesthetics perspective those holes look ugly and there surely should be a better way of arranging stuff for the scaffolding or plumbing.

From the physics perspective, the holes won't effect structural integrity significantly as their surface area is minimal vs total area and structural engineering cals are generally done with at least 200% reliability factor, so I would say it was rather a certifier personal problem that he was not okay with that.

But from pure aesthetics perspective those holes look ugly and there surely should be a better way of arranging stuff for the scaffolding or plumbing.

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This is an extract from the plywood bracing association of Australia, so we dont have to speculate any more

An 'of interest' comment,,, a neatly cut round hole(s) can strengthen many structures as aeronautic and many other engineers will attest but neat and well positioned holes are much different to those bashed through a structure.Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Share

An 'of interest' comment,,, a neatly cut round hole(s) can strengthen many structures as aeronautic and many other engineers will attest but neat and well positioned holes are much different to those bashed through a structure.Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Share

youre 100% correct. Smashing holes through the bracing ( as was explained to me by my certifier) weakens the bracing.

Also its very poor building practice. its the same with penetrations through i joists